
EZ-USB FX2 Technical Reference Manual
Page 11-4 EZ-USB FX2 Technical Reference Manual v2.1
Figure 11-2. FX2 to Standard 8051 Timing Comparison
11.4 Software Compatibility
The FX2 is object-code-compatible with the industry-standard 8051 microcontroller. That is, object
code compiled with an industry-standard 8051 compiler or assembler executes on the FX2 and is
functionally equivalent. However, because the FX2 uses a different instruction timing than the
standard 8051, existing code with timing loops may require modification.
The FX2 instruction timing is identical to that of the Dallas Semiconductor DS80C320.
11.5 803x/805x Feature Comparison
Table 11-2 provides a feature-by-feature comparison between the FX2 and several common 803x/
805x devices.
PSEN
ALE
XTAL1
AD0-AD7
PSEN
PORT2
FX2
Standard
PORT2
Single-Byte, Single-Cycle Instruction Timing
AD0-AD7
4
12
8051
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